Hi guys, I recently performed an experiment, in which I found the B-H hysteresis loops for four ferromagnetic materials. I've attached a graph of my results for one alloy in the link below, where the labels are the saturation magnetization for each driving voltage. http://imgur.com/a/2H246 My question is: why are there four different values for the saturation magnetisation, when online values are often quoted as a single value? The B-H loop was acquired by placing the material inside a solenoid, and driving a sinusoidally varying voltage of 1-4 amps at a frequency of 1Hz through the coils. Is there any way to link the driving voltage to the applied magnetic field? Like in this graph: https://commons.wikimedia.org/wiki/File:B-H_loop.png. Any help would be appreciated!